Subject Power System Analysis Q 2)The single-line diagram of a three-phase system is shown in Fig. 1. Using the common base Sp =50 MVA, draw the impedance diagram in per unit including the load impedance. Themanufacturer's nominal ratings are given as follows:Bus 0Bus 2Line 1G2T2Line 2Line 3Bus 3T3Bus 4LoadDeviceS.Generator G,:48 MVA20 kV20%Generator G,:25 MVA13.8 kV15%Transformer T1:50 MVA20/110 kV8%Transformer T2:30 MVA13.8/110 kV6%Transformer T3:50 MVA11/110 kV10%The three-phase load at bus 4 absorbs 60 MyA at 0.75 power factor (lagging), and lines 1, 2, and3 have the reactance of 402, 32 Q, and 300, respectively.

This solution discusses about PU concept, PU single line diagram of a power system based on given…

Q 2) The single-line diagram of a three-phase system is shown in Fig. 1. Using the common base Sp = 50 MVA, draw the impedance diagram in per unit including the load impedance. The manufacturer's nominal ratings are given as follows: Bus O Bus 2 Line 1 T1 T2 Line 2 Line 3 Bus 3 T3 Bus 4 Load Device Generator G,: 48 MVA 20 kV 20% Generator G,: 25 MVA 13.8 kV 15% Transformer T1: 50 MVA 20/110 kV 8% Transformer T2: 30 MVA 13.8/110 kV 6% Transformer T3: 50 MVA 11/110 kV 10% The three-phase load at bus 4 absorbs 60 MVA at 0.75 power factor (lagging), and lines 1, 2, and 3 have the reactance of 400, 32 0, and 300, respectively.

Q 2) The single-line diagram of a three-phase system is shown in Fig. 1. Using the common base Sp = 50 MVA, draw the impedance diagram in per unit including the load impedance. The manufacturer's nominal ratings are given as follows: Bus O Bus 2 Line 1 T1 T2 Line 2 Line 3 Bus 3 T3 Bus 4 Load Device Generator G,: 48 MVA 20 kV 20% Generator G,: 25 MVA 13.8 kV 15% Transformer T1: 50 MVA 20/110 kV 8% Transformer T2: 30 MVA 13.8/110 kV 6% Transformer T3: 50 MVA 11/110 kV 10% The three-phase load at bus 4 absorbs 60 MVA at 0.75 power factor (lagging), and lines 1, 2, and 3 have the reactance of 400, 32 0, and 300, respectively.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.44P: Two balanced three-phase loads that are connected in parallel are fed by a three-phase line having a...

See similar textbooks

Similar questions

A three-phase line with an impedance of (0.2+j1.0)/ phase feeds three balanced three-phase loads connected in parallel. Load 1: Absorbs a total of 150 kW and 120 kvar. Load 2: Delta connected with an impedance of (150j48)/phase. Load 3: 120 kVA at 0.6 PF leading. If the line-to-neutral voltage at the load end of the line is 2000 v (rms), determine the magnitude of the line-to-line voltage at the source end of the line.
Exercise 1: A three-phase 3Φ transmission line has an impedance of 0.62+j35.06Ω/phase and supplies a three-phase load of 100MW with a power factor (fp) of 0.8 lagging at 200kV. Taking 100MVA and 215kV as a base, we ask: a-) Calculate the impedance of the line in p.u;b-) Calculate the current consumed by the load in p.u;c-) Calculate the load voltage in p.u; PLEASE, TYPE, HAND WRITING GETS UNDERSTANDING.
Exercise 1: A three-phase 3Φ transmission line has an impedance of 0.62+j35.06Ω/phase and supplies a three-phase load of 100MW with a power factor (fp) of 0.8 lagging at 200kV. Taking 100MVA and 215kV as a base, we ask: d-) Calculate the complex power consumed by the load in p.u;e-) Calculate the voltage at the emitter terminal in p.u;f-) Calculate the LT impedance taking 200MVA and 150kV as a new base. PLEASE, TYPE, HAND WRITING GETS UNDERSTANDING.
PROBLEM 1. A three-phase transmission line is 100 km long. Its parameters are: z= (0.08 + j0.45) Ω/km y=j5 μS/km At the generating end it has a voltage of 115 kV L-L, and it is delivering a real power of PS= 51 MW and a reactive power of QS=31.6 MVARS. a. Find the parameters A,B,C and D. b. Determine the voltage and current at the receiving end. C. Calculate the regulation of the load node.
A 4200-V, three-phase transmission line has an impedance of 4+j ohms per phase. If it supplies a load of 1 MVA at 0.75 power factor, find: (a) the complex power (b) the power loss in the line (c) the voltage at the sending end. *Ans. S=0.75+j0.66 MVA, PL=25.14 kW and VS=4.492∠ − 1.912°kV Use four decimal places.
1. A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase series impedance of 0.125+j0.4375 Ω per km. Determine the sending end voltage, voltage regulation, the sending end power, and the transmission efficiency when the line delivers (a) 70 MVA, 0.8 lagging power factor at 64 kV. (b) 120 MW, unity power factor at 64 kV. Use lineperf program to verify your results. 2. A three-phase, 765-kV, 60-Hz transposed line is composed of four ACSR, l,431,000-cmil, 45/7 Bobolink conductors per phase with flat horizontal spacing of 14 m. The conductors have a diameter of 3.625 cm and a GMR of 1.439 cm. The bundle spacing is 45 cm. The line is 400 km long, and for the purpose of this problem, a lossless line is assumed. (a) Determine the transmission line surge impedance Zc, phase constant ß, Wavelength, the surge impedance loading SIL, and the ABCD constant. b) The line delivers 2000 MVA at 0.8 lagging power factor at 735 kV. Determine the sending end quantities and…
hallo A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase series impedance of 0.125 + j0.4375 ohm per km. Determine the sending end voltage, voltage regulation, the sending end power, and the transmission efficiency when the line delivers 70 MVA, 0.8 lagging power factor at 64 kV. 120 MW, unity power factor at 64 kV. Use lineperf program to verify your results.
single circuit three-phase line, 60 Hz, 18 km has a total resistance and inductive reactance of 4.242 ohm and7.451 ohm per phase respectively. The line delivers 2500 kW to a balanced load at 11 kV. (1) determine the sending-end voltage when the power factor is (i) 80% lagging, (i) unity, and (ii) 90 % leading, (2) draw the phasor diagrams of the line at the above (3) determine the voltage regulation of the line at the above power factors.
From the Single Line Diagram below, the 3-phase generator in Y-connection supplies electrical power toa 3-phase load of 30 KW, PF 0.8 lagging via transmission line with reactance 1j Ω/phase. At node 2, thecapacitor C2 will be inserted to improve power factor to be 0.9 lagging. 1. Draw equivalent circuit of this power system. 2. Determine single phase voltage and current in the system before and after PF correction. 3. Calculate 3-phase power delivered to the load.
A 3-phase, 50 Hz, overhead transmission line delivers 10 MW at 0·8 p.f. lagging and at 66 The resistance and inductive reactance of the line per phase are 10 W and 20 W respectively while capacitance admittance is 4 × 10- 4 siemen. Calculate : (i)the sending end current (ii) sending end voltage (line-to-line) (iii) sending end power factor (iv) transmission efficiency Use nominal T method.
A load of 140 MW at a power factor of 0.6 lagging can be delivered by a 3-phase transmission line. The voltage at the receiving end is to be maintained at 33 kV and the loss in the transmission as 8 % of the power delivered. (Consider the line to be a short transmission line) Find: 1)Single phase Power delivered: 2)Per phase voltage: 3)Current flowing through the transmission line: 4) 3 Phase Losses in the transmission line: 5) Per phase resistance of the transmission line :
A load of 130 MW at a power factor of 0.6 lagging can be delivered by a 3-phase transmission line. The voltage at the receiving end is to be maintained at 57 kV and the loss in the transmission is 5.5 % of the power delivered. (Consider the line to be a short transmission line) Find: A) Single phase Power delivered. B) Per phase voltage. C) Current flowing through the transmission line. D) 3 Phase Losses in the transmission line. E) Per phase resistance of the transmission line.